Fun 'n Games with C: An innocuous seeming pair of parentheses turns an infinite loop into a end-run around the C preprocessor.

evil.c

#include <stdio.h>

void method(char* first, char* second, char* third)
{
  printf("method arguments - first: %s, second: %s, third: %s\n", first, second, third);
  return;
}

void wrapped_method(char* first, char* second, char* third);
#define method(first, second, third) wrapped_method((second), (third), (first))

void wrapped_method(char* first, char* second, char* third)
{
  printf("wrapped_method arguments - first: %s, second: %s, third: %s\n", first, second, third);
  printf("Calling the *real* method...");
  (method)(second, third, first); //remove the parens around "method" and the result is very different...
  return;
}

int main(int argc, char* argv[])
{
  printf("Calling: method(one, two, three)\n");
  method("one", "two", "three");
  return 0;
}